In RT △ ABC, if Tan α = 2, then sin α =?, cos α =? There is no picture

Tana = Sina / cosa = 2, Sina = 2cosa
Because Sina * Sina + cosa * cosa = 1
All 4cosa * cosa + cosa * cosa = 1
cosa*cosa=1/5
Cosa = root 5 / 5
Sina = 2cosa = 2 radical 5 / 5

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